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In astronomy, metallicity is the abundance of elements present in an object that are heavier than hydrogen and helium. Most of the normal currently detectable (i.e. non-dark) matter in the universe is either hydrogen or helium, and astronomers use the word "metals" as convenient shorthand for "all elements except hydrogen and helium".
It is not just heavy metals which can be toxic; other metals (for example beryllium and lithium) can be toxic too. [266] Sleeping in a closed room with an electric fan running does not result in "fan death", as is widely believed in South Korea among older people. [267] [268] As of 2019 this belief was in decline. [269]
The Magellanic Stream is a stream of high-velocity clouds of gas extending behind the Large and Small Magellanic Clouds over 100° through the Galactic south pole of the Milky Way. Associated with the stream is the leading arm feature. [1] The stream was sighted in 1965 and its relation to the Magellanic Clouds was established in 1974.
An artist's concept of a planetary system. A planetary system is a set of gravitationally bound non-stellar bodies in or out of orbit around a star or star system.Generally speaking, systems with one or more planets constitute a planetary system, although such systems may also consist of bodies such as dwarf planets, asteroids, natural satellites, meteoroids, comets, planetesimals [1] [2] and ...
The average amount of heavier elements relative to hydrogen, known as metallicity in astronomy, ranges from a third to a half of the value in the sun. [1] [2] Studying the chemical composition of the ICMs as a function of radius has shown that cores of the galaxy clusters are more metal-rich than at larger radii. [2]
A Question and Answer Guide to Astronomy is a book about astronomy and cosmology, and is intended for a general audience. The book was written by Pierre-Yves Bely , Carol Christian , and Jean-Rene Roy , and published in English by Cambridge University Press in 2010.
At these high frequencies, molecules in the Earth's atmosphere can block transmissions from space, and telescopes must be located in dry (water is an important atmospheric blocker), high sites. Radio telescopes must have very accurate surfaces to produce high fidelity images.
This glossary of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology, their sub-disciplines, and related fields. Astronomy is concerned with the study of celestial objects and phenomena that originate outside the atmosphere of Earth. The field of astronomy features an extensive vocabulary and a ...